LXR linux/include/misc/charlcd.h

   1/*
   2 * Character LCD driver for Linux
   3 *
   4 * Copyright (C) 2000-2008, Willy Tarreau <w@1wt.eu>
   5 * Copyright (C) 2016-2017 Glider bvba
   6 *
   7 * This program is free software; you can redistribute it and/or
   8 * modify it under the terms of the GNU General Public License
   9 * as published by the Free Software Foundation; either version
  10 * 2 of the License, or (at your option) any later version.
  11 */
  12
  13struct charlcd {
  14        const struct charlcd_ops *ops;
  15        const unsigned char *char_conv; /* Optional */
  16
  17        int ifwidth;                    /* 4-bit or 8-bit (default) */
  18        int height;
  19        int width;
  20        int bwidth;                     /* Default set by charlcd_alloc() */
  21        int hwidth;                     /* Default set by charlcd_alloc() */
  22
  23        void *drvdata;                  /* Set by charlcd_alloc() */
  24};
  25
  26struct charlcd_ops {
  27        /* Required */
  28        void (*write_cmd)(struct charlcd *lcd, int cmd);
  29        void (*write_data)(struct charlcd *lcd, int data);
  30
  31        /* Optional */
  32        void (*write_cmd_raw4)(struct charlcd *lcd, int cmd);   /* 4-bit only */
  33        void (*clear_fast)(struct charlcd *lcd);
  34        void (*backlight)(struct charlcd *lcd, int on);
  35};
  36
  37struct charlcd *charlcd_alloc(unsigned int drvdata_size);
  38
  39int charlcd_register(struct charlcd *lcd);
  40int charlcd_unregister(struct charlcd *lcd);
  41
  42void charlcd_poke(struct charlcd *lcd);
  43